package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;

import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;

import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;

import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<Dish> page = dishMapper.page(dishPageQueryDTO);

        List<Dish> records = page.getResult();
        Long total = page.getTotal();


        return new PageResult(total, records);
    }

    @Transactional
    public void save(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.insert(dish);

        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {

            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            System.out.println(flavors);
            dishFlavorMapper.insert(flavors);
        }

    }

    @Transactional
    public void delete(List<Long> ids) {
        //判断当前菜品是否能够删除--是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            //当前菜品在售，无法删除
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除--是否关联套餐？？
        List<Long> mealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);

        if (mealIds != null && mealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }

        //删除菜品
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品相关的口味表数据
            dishFlavorMapper.deleteByDishId(id);
        }


    }

    @Override
    public DishVO getById(Long id) {

        Dish dish = dishMapper.getById(id);

        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Transactional
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表dish的数据
        dishMapper.update(dish);
        //删除菜品-口味关联表数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //插入新的菜品-口味关联表数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
        }
        dishFlavorMapper.insert(flavors);


    }

    @Override
    public List<DishVO> list(Long categoryId) {
            Dish dish = Dish.builder()
                    .categoryId(categoryId)
                    .status(StatusConstant.ENABLE)
                    .build();
         List<Dish> list =  dishMapper.list(dish);
        List<DishVO> listVO = new ArrayList<>() ;
        DishVO vo = new DishVO();
        for (Dish d : list) {
            BeanUtils.copyProperties(d,vo);
            listVO.add(vo);
        }

       return listVO;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}